package com.luty.rpc.common.util;

import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;
import org.springframework.objenesis.Objenesis;
import org.springframework.objenesis.ObjenesisStd;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created by Luty on 2017/6/15.
 */
public class SerializationUtil {
    private static Map<Class<?>, Schema<?>> cacheSchema = new ConcurrentHashMap<>();
    private static Objenesis objenesis = new ObjenesisStd(true);

    private SerializationUtil(){}

    /**
     * 序列化（对象 -> 字节数组）
     */

    public static <T> byte[] serialize(T obj){
        Class<T> cls = (Class<T>) obj.getClass();
        LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
        try{
            Schema<T> schema= getSchema(cls);
            return ProtostuffIOUtil.toByteArray(obj, schema, buffer);
        }catch (Exception e ){
            throw new IllegalStateException(e.getMessage(),e);
        }finally {
            buffer.clear();
        }
    }

    public static <T> T deserialize(byte[] data, Class<T> cls){
        try{
            T message = objenesis.newInstance(cls);
            Schema<T> schema = getSchema(cls);
            ProtostuffIOUtil.mergeFrom(data, message, schema);
            return message;
        }catch (Exception e){
            throw new IllegalStateException(e.getMessage(),e);
        }
    }

    public static <T> Schema<T> getSchema(Class<T> cls){
        Schema<T> schema = (Schema<T>) cacheSchema.get(cls);
        if(schema == null){
            schema = RuntimeSchema.createFrom(cls);
            cacheSchema.put(cls, schema);
        }
        return schema;
    }

}
